diff --git a/include/wx/mousestate.h b/include/wx/mousestate.h
index 98ab291baf..8e954ad371 100644
--- a/include/wx/mousestate.h
+++ b/include/wx/mousestate.h
@@ -100,13 +100,11 @@ public:
 
             case wxMOUSE_BTN_NONE:
             case wxMOUSE_BTN_MAX:
-                wxFAIL_MSG(wxS("invalid parameter"));
-                return false;
-
-            default:
-                wxFAIL_MSG(wxS("unknown parameter"));
-                return false;
+                break;
         }
+
+        wxFAIL_MSG(wxS("invalid parameter"));
+        return false;
     }